Cutter for concaving-machines.



J. STROOTMAN.

CUTTER FOR CONCAVING MACHINES.

APPLICATION FILED NOV. 18. I914.

Patented Sept. 14, 1915.

Mill-Inn NOCIRAPH C0.,wAsHlNuToN D c rrnn s rare" PATNT 1Q.

JOHN STRQOTMAN, .OF BUFFALO, NEW YORK] CUTTER FOR CONCAVING-IWACHINES.

Application filed November 18, 1914. Serial No. 872,789.

To aZZwiwm it may concern:

Be it known that 1, JOHN STRooT AN, a citizen of the United States, residing at Buffalo, in the county of Erie and. State of New York, have. invented certain new and useful Improvements in .Cutters for Goncaving-Machines, of which the following is a specification; j

My invention relates to machines for making concavities in solesof made-up shoes, and more particularly relates to improvements in the concaving or cutting mechanism.

This invention, furthermore, relates to certain improvements upon the invention of my former Patent, No. 845,440, issued to me February 26, 1907.

It has been found, in the practical use of the invention of my said former patent, that the cutting tool which forms the desired concavities requires blades or cutters which are removably secured to the rotating part, which may be sharpened readily without removing, and which may be removed and blades or cutters inserted when those in use have become worn or when it is desired to form concavities of difl'erent depths or curvature. And it has been found further that a lead or centering means is essential to steady the shoe while the operation is being performed. 7

To thisend the object of my invention is to provide a machine of this character with removable cutters and an adjustable lead and to provide means for holding the same, and to accomplish the ends which Will be evident from the following specification and the drawings forming a part thereof, in

which like characters of reference indicate corresponding parts, and in which,-

Figure 1 is an elevation of the machine with a shoe in place thereon ready for concaving. Fig. 2 is an enlarged face view of the cutters, the lead and the rotating stud which carries the same. Fig. 3 is a section on the line 33 of Fig. 2. Fig. 4 is a section on the line 44 of Fig. 2. Fig. 5 is a side elevation of a pair of cutters.

The general construction of the machine is shown in Fig. 1, and is substantially that shown in my said former Patent No. 845,440. It consists of a standard 5 which has a base by which it may be rigidly secured to a bench or counter, and this standard is of such shape and size as to enter a made-up shoe and support the same while the con- Specification of Letters Patent.

Patentedfiept. 14, 1915 caving is being performed. Upon the upper end of this standard is. pivoted a sprocket 6, which is internally threaded to receive the threaded stem 7 of the rotatingstud 8. This sprocket is driven inrotationby means of a sprocket-chain 9 which is driven in turnby a sprocket-wheel 10, shown in broken outline inig. ;,uWhi h is drivenbyaslraftallfrom any desired source of power. These features are all substantially the same as shown in my said patent and operatesubstantially in the manner therein described, and for a more detailed description of this part of the machine reference is had to that patent.

The rotating stud comprises the disk 8 and the threaded stem 7. The face of the disk 8 is dovetail slotted to receive the cutters 12. These cutters are provided with dovetail bases, as shown at 13, to fit into the dovetail slot in the disk 8. The two cutters 12 are alike and have the cutting edges 14 formed by the convexity of the upper surface 15 and by the semi-cylindrical or semiconical concavities 16. The convex surfaces 15 are slightly beveled or inclined away from the edges 14, so that the edges of the cutters may be sharpened from the outer surfaces or faces. The cutters are held in their dovetailed positions by means of pins 17, which are driven into holes in the disk 8 and which fit into corresponding borings 18 in the rear sides of the cutters 12. By unscrewing the rotating stud from the sprocket 6 and by driving out the pins 17 the cutters may be slipped out for any desired purpose, such as putting in new ones or putting incutters of different degree of convexity.

In order to secure correct centering of the concaving operation and to prevent the shoe from wabbling, as above referred to, while the concaving is being performed, I bore the rotating stud centrally and cut away the inner, vertical walls of the cutters sufficiently to permit the insertion of a lead 19, which acts the same as the lead on a bit, which may have a gimlet point, or a twist-drill point as shown, and which is adjustable axially so as to bring its point only sufficiently above the apex of the cutters to insure its proper action. It is secured in its proper adjustment by a set-screw (not shown), or ma be otherwise secured.

t will be seen that the desired degree of concavity of cut may be determined by the convexity of the cutting edges of the cuttersthe convexity being clearly shown in claim 1. In combination With a machine of the type described, a rotating stud having a disk-shaped face, a dove-tail slot in said face,cutters having corresponding dove-tail bases to engage in said slot, convex cutting edges on said cutters formed by an outer, beveled surface and an inner semi-cylindrical or semi-conical groove or recess and pins for engaging said cutters and said stud to hold said cutters in place.

' 2. In combination With a machine of the type described, a driven stud, cutters re- Vmovably secured to the face of said stud,

said cutters.

JOHN STROOTMAN. Witnesses:

FRANK M. Ronssnnn, V J. EDW. THEBAUD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

